Improvement in burglar-alarms



g the other side of said plate.

UNITED STATES PATENT @FFI E HENRY FRANCIS GREEN, OF OHETOPA, KANSAS.

IMPROVEMENT IN BURGLA'R-ALARMS.

Specification forming part of Letters Patent No. 178,922, dated J nne'20, 1876; application filed April 10, 1875.

To all whom it may concern:

Be it known that I, HENRY F. GREEN, of Ohetopa, in the county of Labetteand State of Kansas, haveinvented a new and useful Improvement inCombined Door and Window Fastener and Burglar-Alarm, of which thefollowing is a specification:

Figure l is a top view, partly in longitudinal' section, of my improveddevice. afront-end view of the main plate.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish an improved device forattachment to doors and windows to prevent them from being opened fromthe outside, and to give an alarm should any one attempt to open them. I

To this end the construction and arrangement of parts are as follows:

A represents the main plate of the device upon the forward end of whichare formed points a or a sharp-edged jaw, to be forced into a door-jambby closing the door against a is a stop, formed upon the same side ofthe plate A as the points a to regulate the adjustment of the device inplace.

Bis a plate, made with a thick forward end,

and pivoted near its rear end to the plate A, in such a position thatits forward end may be about opposite the stop (o The rear part of theplate B has a short longitudinal slotformed in it to receive the pivot,so that it may have a slight longitudinal movement upon said pivot.

O is an intermediate plate, interposed between the platesA B, andpivoted to the same pivot as the plate B. The plate 0 is designed to beturned up along the side of the plate A, when the space between thedoor-casing and the edge of the door is wide, to fill up the said space,and which is allowed to hang down when the said space is narrow.

Upon the side edge of the plate A is formed a flange, D, which hasseveral holes formed in it to receive screws, for securing the device toa window-casing or sash-rail, and to which or to some other support ispivoted a hammer, E, somewhat similar to a gun-hammer,wh1ch,

Fig.2is

when thrown forward, strikes and explodes a cap placed upon a tube, F,attached to the plate A.

The hammer E is thrown to explode the cap by a spring, Gr, attached tothe rear end of the plate A, and the free end of which presses against aprojection, 6, formed upon the rear part ofthe said hammer E.. v v

The hammer E is held back, when cocked, by a trigger, H, the upper endof which enters a notch in the lower forward side of the hammer E. Thetrigger H is pivoted to the flange D, and its lower end projects througha slot in the plate A, into such a position that it may be struck by therearend of the plate B, should said plate be pushed backby an attempt toopen the door from the outside.

In using the device in connection with a door, the forward end of theplate A is placed against the rabbet of the door-casing, with the pointsa resting against said casi1.1g, and the stop a resting against thecorner of the casing. The door is then closed, which forces the points ainto the casing, the plate 0 being used. or

not, as may be required. The plate B is turned up and pushed forwardtill its forward end rests againstthe door. The hammer E is then drawnback and secured by the trigger H, and a cap is placed upon the tnbe'F.If, now, an attempt be made to open the door, the plate B is pushed backagainstthe trigger H, which releases the hammer E and explodes the cap.The rearward movement of the plate B is so slight that it still holdsthe door securely fastened.

When the device is used for fastening a windowsash, it is secured to thewindow-casing by means of the flange D, with the end of the plate Bresting upon the top rail of the lower sash, so that any attempt toraise said sash may explode the cap. WVhen used in connection withwindow blinds or shutters, it is laid upon the water-table of thewindow, and se- I cured to the bottom rail of the sash by means of theflange D. A small cord is then attached to the lower end of the triggerH, is passed ter, so that any attempt. to open the said blind twopivoted plates B O, the hammer E,tiie or shutter will release the hammerand excap tube Ethe spring G, and the trigger H,

plode the cap. substantially as herein shown and described.

Haviiwthns described niyinven't-ion I claim 1 e as new 231d desire tosecure by Letters Put- HENRY FRANQIS GREEN" ent- 4 Witnesses: Thecombination of the plate A, provided LEROY NEALE, with the points or jaw60 and the stop a", the GEO. W. FOX.

